title: Entanglement distribution over 300 km of fiber.
abstract: We report the distribution of time-bin entangled photon pairs over 300 km of optical fiber. We realized this by using a high-speed and high signal-to-noise ratio entanglement generation/evaluation setup that consists of periodically poled lithium niobate waveguides and superconducting single photon detectors. The observed two-photon interference fringes exhibited a visibility of 84%. We confirmed the violation of Bell's inequality by 2.9 standard deviations.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Inagaki
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Matsuda
authors.forename: Osamu
authors.initials: O
authors.lastname: Tadanaga
authors.forename: Masaki
authors.initials: M
authors.lastname: Asobe
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takesue